Certification VMware Certified Professional (VCP4) Home Page
VCP 4 Blueprint
VMware vSphere 4.1 Documentation

Critical documents which you must know 100% are:

• Configuration Maximums for VMware vSphere 4.1
• Fibre Channel SAN Configuration Guide
• iSCSI SAN Configuration Guide

But you really need to read all the documentation on the “Release Notes and Compatablity Page” and “Guides and Papers”